Drag and drop each description to show whether it is a characteristic of carriers, channels, or both. Carriers allows passive transport of molecules/ions Channels Both Carriers and Channels only allows molecules/lons of specific sizes to flow through changes shape when functioning has hydrophobic R-groups that interact with the interior of lipid bilayers acts as an open "tunnel" through a membrane
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- Diffusion and osmosis classification Classify the following characteristics based on whether they are describing diffusion, osmosis, or both. Diffusion Results in an Can occur with equal distribution of solute molecules or without a membrane Always involves the movement of water Requires a semi-permeable membrane Osmosis Involves the movement of gases, ions, and small water soluble molecules Passive form of movement that requires no energy Moves from areas of high concentration to low Both Diffusion and Osmosis Responsible for gas exchange in the lungs concentration A 3 of 15 Next > Cation to open the document "Epicinstaller-13.0.0-fortnite-a8e4f12cada646caa706d8be407be69f (3).msi". tv 22The fluid mosaic model of membrane structure has been very useful in explaining membrane behavior. However, the description of membrane as proteins floating in a phospholipid sea is oversimplified. Describe some components of membrane that are restricted in their lateral motion.Identify basic structure of the 8 types of membrane proteins shown below Understand how primary structure (e.g., regional hydrophobicity and hydrophilicity) allows proper membrane interaction/association. Compare/contrast the degree to which proteins are attached to membranes. Which have more lateral movement? Diversity of attachment and lateral movement allows efficient function. Understand where glycosylated lipids and proteins are found and what general functions they serve. Know the role/significance of cysteine disulfide bonds. On which side of the plasma membrane do they generally occur? Why? lipid bilayer A La s *****P & de www CYTOSOL COOH NH₂ cccccce 6
- Two theories of membrane structure are discussed below. Unit Membrane Model Phospholipid molecules are the most abundant type of lipids in cell membranes. Each consists of a nonpolar, hydrophobic tail, and a polar, hydrophilic head. The phospholipid chains orient themselves to form a bilayer with the tails pointed inward and the hydrophilic heads lined up on both sides of the bilayer. An extended monomolecular layer of protein coats both the outside of the membrane and the inside of the bilayer, but the protein does not penetrate the bilayer. When thin slices of membranes were examined with an electron microscope, three layers were seen: two electron-dense layers, with one wider layer between them. It was believed that the electron-dense layers represented proteins, and the lighter area represented lipids. Fluid Mosaic Model The structure of the fluid mosaic membrane is a bilayer of phospholipid molecules with proteins inserted into the bilayer. Hydrophilic regions of both the lipids…Which of the following membrane lipids is mainly structural? Phosphatidylthanolamine All of the other answers are correct Phosphatidylcholine Spingomyelin Inositol phospholipidsWhich of the following molecules is more likely to diffuse through a synthetic lipid bilayer (i.e. a lipid bilayer without transmembrane transporters). Cl- ethanol
- . channels in the plasma membraneopen or close in response to changes in theelectrical charge difference across themembraneWhat statement about "peripheral" membrane proteins is INCORRECT? Hide answer choices Polar interactions of peripheral protein and polar head groups of the membrane lipids can be disrupted by adding salts or by changing the pH. They are membrane proteins that are anchored to the membrane by a covalently attached lipid molecule. They are membrane proteins that interact with the polar head groups of the membrane lipids. They are membrane proteins that bind to the surfaces of integral proteins. They are membrane proteins that traverse the lipid bilayer. 2. What is the difference between the T form and R form of the hemoglobin molecule? Hide answer choices The T form of the hemoglobin molecule is not constrained by subunit–subunit interactions. The T form of the hemoglobin molecule is unstable without 2,3-BPG. The R form of the hemoglobin molecule has the…Although lipids are largely responsible for providing and maintaining the structure of the Ven membrane, most of the membrane's functions are due to the proteins that are present in it. Membrane proteins can be classified as integral or peripheral, depending on how they are Posiioned in the phospholipid bilaver. Based on figure 12, differentiate integral and peripheral proteins. Write your answer on the table below. Table 18: Difference Between Integral and Peripheral Membrane Proteins Integral Proteins Peripheral Proteins
- In a lipid bilayer, the of all the lipid molecules are sandwiched between all of the __________. a. hydrophilic tails; hydrophobic heads b. hydrophilic heads; hydrophilic tails c. hydrophobic tails; hydrophilic heads d. hydrophobic heads; hydrophilic tailsThe plasma membrane has a hydrophobic interior due to the two present in each phospholipid found in the phospholipid bilayer of the cell membrane. The plasma membrane allows some molecules to cross but not all. Therefore, the plasma membrane is said to be Molecules that are nonpolar and hydrophobic will cross the membrane with ease by Does this process require energy? When molecules move across the plasma membrane by passive transport, they will move down or with the_ from an area of concentration to an area of. concentration. Polar, hydrophilic molecules and charged ions will move across the plasma membrane by the process of_ This does not require energy, but it does require a A special case of diffusion is known as which is the movement of water across the plasma membrane. If a cell is placed into a solution that is hypertonic compared to the inside of the cell, the cell would If a cell is placed into a hypotonic solution compared to the inside of the cell, the cell water. would…In the image provided what membrane property is being demonstrated? membrane selective permeability of membrane for water molecules by diffusion O selective permeability of membrane for water molecules by osmosis fluid mosaic model of membrane fluidity O the effect of cholesterol in buffering membranes